NDLI: High-frequency nonlinear earthquake simulations on petascale heterogeneous supercomputers

Content Provider	ACM Digital Library
Author	Withers, Kyle Day, Steven M. Wang, Peng Mu, Dawei Cui, Yifeng Olsen, Kim B. Savran, William H. Roten, Daniel
Abstract	The omission of nonlinear effects in large-scale 3D ground motion estimation, which are particularly challenging due to memory and scalability issues, can result in costly misguidance for structural design in earthquake-prone regions. We have implemented nonlinearity using a Drucker-Prager yield condition in AWP-ODC and further optimized the CUDA kernels to more efficiently utilize the GPU's memory bandwidth. The application has resulted in a significant increase in the model region and accuracy for state-of-the-art earthquake simulations in a realistic earth structure, which are now able to resolve the wavefield at frequencies relevant for the most vulnerable buildings (> 1 Hz) while maintaining the scalability and efficiency of the method. We successfully run the code on 4,200 Kepler K20X GPUs on NCSA Blue Waters and OLCF Titan to simulate a M 7.7 earthquake on the southern San Andreas fault with a spatial resolution of 25 m for frequencies up to 4 Hz.
Starting Page	1
Ending Page	12
Page Count	12
File Format	PDF
ISBN	9781467388153
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2016-11-13
Access Restriction	Subscribed
Subject Keyword	Scec Earthquake ground motion Fault zone plasticity Gpu Nonlinear soil behavior
Content Type	Text
Resource Type	Article

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High-frequency nonlinear earthquake simulations on petascale heterogeneous supercomputers